[WxPython] Video in Gui

[vscson]

I tried running metulburr's example and don't understand. What is the purpose of the section starting at 162? Is this supposed to be in a different file? If I run it as is, I get AttributeError: module 'run' has no attribute 'main'. If I save above 162 to run.py and the rest to foo.py and run foo, it says AttributeError: module 'run' has no attribute 'main'. I am new enough at python to know I'm missing something important.